She woke up in the hospital with pine needles in her disheveled hair, dried blood on her hands and elbows, and no recollection of how she got there.

The Palo Alto woman also testified Friday that the last thing she remembered was drinking and dancing next to her younger sister at a fraternity party at Stanford University the night of Jan. 17, 2015.

“I didn’t know where my sister was; I didn’t know where I was,” the woman told jurors before she started sobbing so uncontrollably that the prosecutor requested a recess.

The 23-year-old took the witness stand Friday in the sexual assault trial of Brock Turner, a former Stanford student and all-star swimmer who two bicyclists spotted atop an unconscious woman after midnight on Jan. 18, 2015, according to police.

Turner appeared in the Palo Alto county courtroom wearing khaki pants and a dark blazer, accompanied by his parents and other supporters.

The Ohio native made eye contact with the woman as well as three other witnesses who testified, and often turned around to look at slides projected onto a screen behind him. At times he crossed his right leg over his left, tapping his foot.

Turner faces three felony counts: sexual penetration of an intoxicated person, sexual penetration of an unconscious person and assault with intent to rape an intoxicated or unconscious person.

The Santa Clara County District Attorney’s Office initially charged Turner with five felony charges, but later reduced the counts to three.

When the woman returned to the stand after recess, she picked up at the part where she realized what had happened to her — after hospital staff and police allowed her to use the restroom.

She pulled down her pants and reached at her underwear, but it wasn’t there, she testified.

“That’s when it hit me that what the deputy talked about was real and I was scared,” the woman said.

She peed. She wrapped herself in a blanket. She went back to sleep.

The woman told the jurors — four women and eight men — she had decided at the last minute to join her sister and her sister’s friends at the campus party.

The woman, 22 at the time and working as an apps content creator, was living with her parents in Palo Alto, having just graduated from UC Santa Barbara.

She said she had never gone to a party at Stanford and thought twice about doing so. She planned to stay home; she had a steady boyfriend who lived in Philadelphia who she talked to every night using Facetime.

But she changed her mind when her sister’s friends came over and started drinking whiskey and champagne. The woman’s mother then drove them to Stanford to meet other female friends.

The woman described “being silly” at the party to make her sister laugh. They sang loudly, danced goofy and pretended to be formally greeting guests.

The woman remembers the group going outside to urinate behind a tree, and the others talking to “three Caucasian guys shorter than me” at the party. One of the guys gave her a beer. She abstained when others started to “shotgun” beers, meaning they punched a hole at the bottom of the can to drink the beverage quickly.

She remembers “nothing” after that.

One of the girl friends in the group also testified Friday. She identified the defendant as Turner and said he tried to kiss the woman’s sister at the party.

“She thought it was weird” and moved her head away, the friend said.

About 12:20 a.m., using an Uber ridesharing service receipt as evidence, the friend said she and the woman’s sister accompanied another friend home.

They left the woman and another girlfriend behind. When they returned, they couldn’t find either of them. They looked for her, peeking into different rooms at the frat, and called and texted her without any response.

The friend said her best guess was that the woman, a college graduate, didn’t want to party at a college and decided to go to downtown Palo Alto instead.

They left, noticing police lights next to the fraternity house.

Police were called to an area by a shed and basketball courts near the Kappa Alpha fraternity by two men biking to the party.

Lars Peter Jonsson, a Stanford student from Sweden, testified Friday that he and a friend realized something was strange about the couple on the ground: A man was “thrusting” against a body that wasn’t moving at all.

“Is everything OK?” Jonsson shouted.

When the man, who Jonsson identified as Turner, turned around, Jonsson saw the woman, the area of her genitals exposed.

Jonsson said the man backed away and then tried to flee before Jonsson tripped and held him with the help of his friend, until police arrived.

In a cross-examination, Turner’s attorney, Michael Armstrong of Nolan, Armstrong & Barton in Palo Alto, asked Jonsson whether he noticed a change in Turner’s clothing from the time he was on the ground to when police arrived. Jonsson said he did not.

Turner’s clothing was disheveled and torn, and marked with debris, said Kristine Setterlund, the nurse who examined both Turner and the woman on Jan. 18, 2015.

Abrasions and either vegetation or soil was found on various parts of Turner’s body, including his right arm, hands and back.

“He was quiet, he was cooperative and he made good eye contact with me,” Setterlund said of Turner’s demeanor.

Deputy District Attorney Alaleh Kianerci asked for Setterlund’s expert opinion to be certified in the case and Judge Aaron Persky approved.

Setterlund, who examined the woman at Valley Medical Center in San Jose, said she has performed more than 700 Sexual Assault Response Team exams in her 28 years as a nurse and has been a certified court expert witness in dozens of cases.

The woman had “significant trauma” to her genitalia, and had abrasions and debris not typically found in the vaginal area, Setterlund said.

Setterlund said she can’t tell what caused the penetration. She described how an injury can occur absent of the pelvic tilt and lubrication that exists during consensual sex. And, how sometimes there’s more injury when alcohol is involved because people are not in control of their bodies.

“It’s kind of like trains colliding,” she testified.

The trial resumes 9 a.m. Monday, likely with a cross-examination of the woman.

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